Carrier 50VL Single and Three Phase Air Conditioner System Owner’s Manual

Carrier 50VL Single and Three-Phase Air Conditioner System

NOTE TO EQUIPMENT OWNER
For your convenience, please record the model and serial numbers of your new equipment in the spaces provided. This information, along with the installation data and dealer contact information, will be\ helpful should your system require maintenance or service. Our products are designed, tested and built by DOE-standardized procedures; however, actual operating results and efficiencies may vary based on manufacturing and supplier tolerances, equipment configuration, operating conditions and installation practices.

Safety Considerations

Improper installation adjustment, alteration, service, maintenance, or use can cause an explosion, fire, electrical shock, or other conditions that may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product Refer to the individual instructions packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Use a quenching cloth for brazing operations. Have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in the literature and attached to the unit. Consult local building codes and the current editions of the National Electrical Code (NEC) NFPA 70. In Canada refer to the current editions of the Canadian Electrical Code CSA C22.1.

Recognize safety information. This is the safety alert symbol. When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these signal words; DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death.
WARNING signifies hazards that could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions that will result in enhanced installation, reliability, or operation.
NOTE: Installer: This manual should be left with the equipment user

WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, death, and/or property damage. Installation and servicing of this equipment can be hazardous due to mechanical and electrical components. Only trained and qualified personnel should install, repair, or service this equipment.

WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death, and/or property damage. Do not store or use combustible materials, gasoline, or other flammable vapours and liquids in the vicinity of this or any other appliance.

WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury and/or death. Before performing recommended maintenance, be sure the main power switch to the unit is turned off and a lock-out tag is installed.

CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury. When removing access panels or performing maintenance functions inside your unit, be aware of sharp sheet metal parts and screws. Although special care is taken to reduce sharp edges to a minimum, be extremely careful and wear appropriate clothing, safety glasses and gloves when handling parts or reaching into the unit.

WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, death or property damage. Do not use this unit if any part has been underwater. Immediately call a qualified service technician to inspect the unit and to replace any part of the control system that has been under water.

Starting or Shutting the Unit Off

To start the unit

1. Turn on the electrical power supply to the unit.
2. Select temperature and set MODE control to the desired mode.

To shut the unit off:
NOTE: If the unit is being shut down because of a malfunction, call your dealer as soon as possible.

1. Set system MODE control to OFF.
2. Turn off the electrical power supply to the unit.

Operating Your Unit
The operation of your unit is controlled by an indoor thermostat. You simply adjust the thermostat and it maintains the indoor temperature at the level you select. Most thermostats of cooling systems have 3 controls: a temperature control selector, a FAN control, and a SYSTEM or MODE control. Refer to your thermostat owner’s manual for more information. To better protect your investment and eliminate unnecessary service calls, familiarize yourself with the following facts:

Cooling Mode

the SYSTEM or MODE control is set to COOL, your unit will run in cooling mode until the indoor temperature is lowered to the level you have selected. On extremely hot days, your unit will run for longer periods at a time and have shorter “off” periods than on moderate days. Heating Mode (if installed with optional electric heat) Your system may also be equipped with an electric heating source. On cold days and nights, place your MODE control to HEAT and your system will automatically turn on the supplemental heat to maintain the level of comfort you have selected.

Maintenance and Service

This section discusses maintenance that should be performed on your system. Most maintenance should be performed by your dealer. You, as the owner, may wish to handle some minor maintenance for your new unit.

Routine Maintenance
All routine maintenance should be handled by skilled, experienced personnel. Your dealer can help you establish a standard procedure. To ensure the proper functioning of the unit, the flow of condenser air must not be obstructed from reaching the unit. Clearance from the top of the unit is 48 in. (1219 mm). Clearance of at least 36 in.(914 mm) is required on all sides except the power entry side (42 in. [1067 mm] clearance) and the duct side (12 in. [305 mm] minimum clearance).

Maintenance and Care for the Equipment Owner
Before proceeding with those things you might want to maintain yourself, please carefully consider the following:

WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK AND CUT HAZARD
Failure to follow this warning could result in personal injury, death or property damage.

1. TURN OFF ELECTRICAL POWER TO YOUR UNIT BEFORE SERVICING OR PERFORMING MAINTENANCE.
2. When removing access panels or performing maintenance functions inside your unit, be aware of sharp sheet metal parts and screws. Although special care is taken to reduce sharp edges to a minimum, be extremely careful when handling parts or reaching into the unit. Wear safety glasses, gloves, and appropriate protective clothing.

Air Filters

The air filter(s) should be checked every 3 or 4 weeks and changed or cleaned whenever it becomes dirty. Dirty filters produce excessive stress on the blower motor and can cause the motor to overheat and shut down. This unit must have air filters in place before it can be operated. These filters can be located in one of at least two places. In many applications, the installer will provide return air filter grilles mounted on the wall or ceiling of the conditioned structure. In the instance of filter grilles, the filters can simply be removed from the grille and replaced.

The other typical application is an accessory filter rack installed inside the unit itself. The following information is given to assist in changing the filters used in these internal filter racks. Filter kits are available as a purchased accessory or a factory-installed option. The same filter kit is included with the accessory economizers and factory-installed economizers. See Table 1 for filter sizes supplied with accessory filter rack

Table 1 – Replacement Filter Size

(508 x 305 x 25 mm)

30| 2 each 20 x 12 x 1

(508 x 305 x 25 mm)

36| 1 each 24 x 18 x 1 (610 x 457 x 25 mm),

24 x 16 x 1 (610 x 406 x 25 mm)

42| 1 each 24 x 14 x 1 (610 x 356 x 25 mm),

24 x 16 x 1 (610 x 406 x 25 mm)

48| 1 each 24 x 18 x 1 (610 x 457 x 25 mm),

24 x 16 x 1 (610 x 406 x 25 mm)

60*| 1 each 24 x 18 x 1 (610 x 457 x 25 mm),

24 x 16 x 1 (610 x 406 x 25 mm)

Units with bent indoor coil.
To replace or inspect filters in the accessory filter rack (See Fig. 2):

1. Remove the filter access panel using a 5/16-in. nut driver.
2. Remove the filter(s) by pulling it out of the unit. If the filter(s) is dirty, clean it or replace it with a new one.

When installing the new filter(s), note the direction of the airflow arrows on the filter frame, which should be pointed at the indoor coil. Reinstall the filter access panel ensuring the opening is air and water-tight. If you have difficulty locating your air filter(s) or have questions concerning proper filter maintenance, contact your dealer for instructions. When replacing filters, always use the same size and type of filter that was supplied originally by the installer.

CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in property damage. Never operate your unit without filters in place. An accumulation of dust and lint on internal parts of your unit can cause loss of efficiency and blower motor and/or compressor damage.

Replacing or inspecting filters in units with economizers

Small Chassis (See Fig. 3)

1. Remove the return air duct cover at the rear of the unit using a 5/16-in. nut driver.
2.  Remove the filter(s) by pulling it out and through the unit duct opening. If the filter is dirty, replace both filters with new ones.
3. When installing the new filters, note the direction of the airflow arrows on the filter frame, which should be pointing at the indoor coil.
4. Reinstall the duct cover ensuring the opening is air and water-tight.

Large Chassis (See Fig. 4)

1. Remove the filter access door using a 5/16-in. nut driver.
2. Remove the filter(s) by pulling it out and through the unit filter access door.
3. If the filter is dirty, replace both filters with new ones.
4. For units with bent indoor coils, install a 24 x 18 x 1 (610 x 457 x 25 mm) filter first and then install a 24 x 16 x 1 (610 x 406 x 25) filter.
5. When installing the new filters, note the direction of the airflow arrows on the filter frame, which should be pointing at the indoor coil.
6. Reinstall the filter access door ensuring the opening is air and watertight.

Fans and Fan Motors
Periodically check the condition of fan wheels and housings and fan-motor shaft bearings. Contact your dealer for the required annual maintenance.

Indoor and Outdoor Coils
Cleaning of the coils should only be done by qualified service personnel. Contact your dealer for the required annual maintenance.

Condensate Drain The drain pan and condensate drain line should be checked and cleaned at the same time the cooling coils are checked by your dealer.

Compressor
All compressors are factory shipped with a normal charge of the correct type of refrigeration-grade oil.

Condenser Fan

WARNING
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury, death or property damage. Do not poke sticks, screwdrivers, or any other object into revolving fan blades. The fan must be kept free of all obstructions to ensure proper cooling. Contact your dealer for any required service.

Electrical Controls and Wiring
Electrical controls are difficult to check without proper instrumentation. If there are any discrepancies in the operating cycle, contact your local dealer and request service.

Refrigerant Circuit
The refrigerant circuit is difficult to check for leaks without the proper equipment. If inadequate cooling is suspected, contact your local dealer for service

WARNING
EXPLOSION, BURN AND ENVIRONMENTAL HAZARD
Failure to follow this warning could result in personal injury, death or property damage. The system is under pressure. Relieve pressure and recover all refrigerant before system repair or final unit disposal. Use all service ports and open all flow-control devices, including solenoid valves.

Unit Panels
After performing any maintenance or service on the unit, be sure all panels are fastened securely in place to prevent rain from entering the unit cabinet and to prevent disruption of the correct unit airflow pattern. Regular Dealer Maintenance (Also refer to Table 2) In addition to the type of routine maintenance you might be willing to perform, your unit should be inspected regularly by a properly trained service technician. An inspection (preferably each year) should include the following:

1. Inspection and, if required, cleaning of the outdoor and indoor coils.
2. Inspection and, if required, cleaning of the indoor coil drain pan.
3. Inspection and cleaning of blower wheel housing and motor.
4. Inspection of all supply-air and return-air ducts for leaks, obstructions, and insulation integrity. Any problems found should be resolved at this time.
5. Inspection of the unit base to ensure that no cracks, gaps, etc., exist which may cause a hazardous condition.
6. Inspection of the unit casing for signs of deterioration.
7. Inspection of all electrical wiring and components to ensure proper connection.
8. Inspection for leaks in the refrigerant circuit. Pressure check to determine the appropriate refrigerant charge.
9. Operational check of the unit to determine working conditions. Repair or adjustment should be made at this time.
10. Your servicing dealer may offer an economical service contract that covers seasonal inspections. Ask for further details.
11. Complete service instructions can be found in the unit Installation,
12. Start-up and Service Instructions.

Warranty Certificate
Your unit has a limited warranty. Be sure to read the warranty carefully to determine the coverage for your unit. Before you call for service… …check for several easily solved problems. If insufficient heating or cooling is suspected: ( ) Check for sufficient airflow. Check the air filter for dirt. Check for blocked return-air or supply-air grilles. Be sure they are open and unobstructed. If these checks do not reveal the cause, call your servicing dealer. If your unit is not operating at all, check the following list for easy solutions:

• ( ) Check to be sure that the temperature specified by your User
• The interface is set below the indoor temperature during the cooling season or above the indoor temperature during the heating season. Be sure the User
• The interface is set to COOL or HEAT and not OFF.
• ( ) If your unit still fails to operate, call your servicing dealer for troubleshooting and repairs. Specify the model and serial numbers of your unit.
• (Record them in this manual in the space provided.) If the dealer knows exactly which unit you have, he may be able to offer suggestions over the phone or save valuable time through knowledgeable preparation for the service call.

In Case of Trouble
If you perform the steps above and the unit performance is still unsatisfactory, shut off the unit and call your dealer.

Table 2 – Maintenance Checklist
Monthly maintenance items and outdoor unit rinsing may be performed by the consumer. All other maintenance items and all service work must be performed by a qualified service technician.

Inspect, clean, or replace the air filter if located indoors in return air duct| Monthly
Clear away debris and vegetation near the unit| Annual
Dealer Specific:|
Inspect cabinet and basepan for damage. Replace panels, gaskets, and other components that are damaged or severely rusted. Make sure precipitation has not entered an indoor section of the unit.| Annual
Inspect electrical disconnect for proper function. Repair or replace as necessary.| Annual
Inspect electrical wiring and connections. Tighten loose connections. Inspect and perform functional tests of equipment as needed to ensure proper function. Repair or replace damaged or overheated components and wiring.| Annual
Inspect the electric heater, if installed. Check for signs of overheating of elements, controls, and wiring. Make sure heater elements are not broken or electrically shorted.| Annual
Check refrigerant system subcooling and/or superheating (system dependent)| Annual
Inspect the inside of the unit. Clean if debris is present.| Annual
Inspect the condenser coil. Clean if dust, dirt, or debris is present. Rinse the unit with fresh water (see Note 2).| Annual
Inspect the condenser motor and fan for damage. Make sure the fan spins freely.| Annual
Inspect and clean blower assembly (includes blower housing, wheel, and motor)| Annual
Inspect the evaporator coil. Clean if dust, dirt, or debris is present (see Note 2)| Annual
Clean condensate pan and drain lines (more frequent maintenance may be required in humid climates)| Annual
Inspect the airflow system (ductwork). Check for leaks and repair as needed.| Annual

Read all Warning labels

Notes

1. The above list may not include all maintenance items. Inspection intervals may vary depending on climate and operating hours. Consult your HVAC dealer about a service contract for seasonal inspections.
2. Do not use harsh chemicals or high-pressure water on coils. More frequent rinsing is required for units near a sea coast.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and obligations.

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